Philips Hue Bridge only presents a Philips Hue API to the Philips Hue integration so Home Assistant does not know that the Philips Hue uses Zigbee at all. Philips Hue API abstracts away all Zigbee stuff so it could technically be using any wireless technology and protocols without Home Assistant knowing the difference.
https://www.home-assistant.io/integrations/hue/
Off-topic but recommend buy a Zigbee USB adapter and install either ZHA integration or Zigbee2MQTT.
They have different pros and cons, ZHA is natively integrated into Home Assistant, while Zigbee2MQTT convert Zigbee to MQTT and works as a external stand-alone gateway (similar to Philips Hue Bridge).
https://www.home-assistant.io/integrations/zha
https://www.home-assistant.io/docs/mqtt/discovery#support-by-third-party-tools
https://www.zigbee2mqtt.io/guide/usage/integrations/home_assistant.html
Note that you can use several different Zigbee solutions at the same time but they will each need their own dedicated Zigbee adapter/gateway/bridge and every solution will only set up a single Zigbee network and it is not possible to connect different Zigbee networks so they will not be aware of the others in any way.
Personally recommend buy a few of these because can also reflash to use as Zigbee Router (repeater):
Zigbee signals are weak so reply on a strong Zigbee network mesh (meaning many Zigbee Router devices) and are very sensitive to RMF/EMI/RMI interference so it makes it much easier to troubleshoot and find the real root cause if have already optimized your setup and environment to work around that. In practice fact that device is Zigbee only matters if you would instead using ZHA or Zigbee2MQTT.
Before buy and setup/install recommend also reading tips as really apply to all to all Zigbee solutions:
https://github.com/home-assistant/home-assistant.io/pull/18864